diff --git a/setup.py b/setup.py
index 1d914cb421..46139e3629 100644
--- a/setup.py
+++ b/setup.py
@@ -133,7 +133,7 @@ def __getitem__(self, key):
     # Concrete dependencies go in requirements[-dev].txt
     install_requires=[
         "pyomo >= 6.7.3",
-        "pint",  # required to use Pyomo units
+        "pint<0.24",  # required to use Pyomo units. Pint 0.24 only supported on Python >=3.10
         "networkx",  # required to use Pyomo network
         "numpy<2",
         # pandas constraint added on 2023-08-30 b/c bug in v2.1